Leaf burn could be heat or salt build up in soil since were in a drought in Calif. Mexicola is the grafted tree originally but I top worked one trunk to; Reed, Koala,Taft, Joe Naulty,Hazzard, Mayo, Don Gillogly, Holister, Malama ,Gwen, 90yr old Fuerte, Jan Boyce, Mary Criollo were just grafted about month ago and are pushing bud's through para-film. Have two other trees on property but haven't taken pic's yet!